Field Notes Journal

Seasonal Analysis and Species Classification

Blue Tit

Model Family : Resident detectability

Blue Tit (Cyanistes caeruleus), Abingdon, UK
Blue Tit (Cyanistes caeruleus), Abingdon, UK David Walker, Field Notes Journal ( CC BY 4.0 )
Blue Tit (Cyanistes caeruleus), Abingdon, UK
Blue Tit (Cyanistes caeruleus), Abingdon, UK David Walker, Field Notes Journal ( CC BY 4.0 )

Summary

Blue Tit

Resident with summer detectability collapse

Blue Tit is classified as resident with summer detectability collapse. The fitted resident detectability target peaks around March and reaches its lowest point around August. The model indicates strong baseline presence, weak spring carry-over, strong pre-summer retention, moderate summer suppression, and moderate summer decay acceleration.

Confidence
Medium
Fit score
0.255
Peak detectability
March
Lowest detectability
August

Seasonal wheel

Seasonal wheel for Blue Tit Blue Tit Peak: March

Calendar strip

Jan 0.4
Feb 0.57
Mar 0.8
Apr 0.61
May 0.4
Jun 0.38
Jul 0.29
Aug 0.19
Sep 0.29
Oct 0.34
Nov 0.35
Dec 0.46

Highlighted months indicate stronger modelled presence or detectability. A ring marks the fitted peak; a hollow mark indicates the trough where available.

Classification evidence

Target peak month
3
Target peak label
March
Target trough month
8
Target trough label
August
Target peak value
0.803
Target trough value
0.187
Target mean value
0.422
Target amplitude
0.616
Baseline to peak ratio
0.407
Autumn to winter weight ratio
0.047
Year end to winter weight ratio
0.366
Decay to growth ratio
1.885

Observed and Simulated Seasonal Patterns

Blue Tit Observed Presence, Abingdon
Blue Tit Observed Presence, Abingdon
Blue Tit Observed Totals, Abingdon
Blue Tit Observed Totals, Abingdon
Blue Tit Simulated Presence, Abingdon
Blue Tit Simulated Presence, Abingdon

Cite this dataset

You are welcome to reuse or reproduce this material under the terms of the Creative Commons CC BY 4.0 licence but please cite it using the reference below, include a link to the licence, and indicate if any changes were made.

Walker, David. Blue Tit. Field Notes Journal. ID FN-WL-SEASONAL. Version 2026.05.21. https://fieldnotesjournal.uk/wildlife/seasonal/abingdon/blue_tit.html

Dataset FN-WL-SEASONAL Author David Walker Publisher Field Notes Journal Version 2026.05.21
Reference: Walker, David. Blue Tit. Field Notes Journal. ID FN-WL-SEASONAL. Version 2026.05.21.

BibTeX 
@dataset{fn_wl_seasonal,
  author = {Walker, David},
  title = {Blue Tit},
  year = {2026},
  publisher = {Field Notes Journal},
  version = {2026.05.21},
  url = {https://fieldnotesjournal.uk/wildlife/seasonal/abingdon/blue_tit.html}
}